package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) &&  @annotation(com.sky.annotation.AutoFill)")
    public  void  autoFillPointCut(){

    }

    @Before("autoFillPointCut()")
    public void  autoFill(JoinPoint joinPoint){
        log.info("开始进行数据填充");
        //获取到当前被拦截的方法上的数据库操作类型
        MethodSignature signature =(MethodSignature) joinPoint.getSignature();//获取方法签名
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获取方法上的数据库操作类型
        OperationType type = autoFill.value();//获取操作类型
        // 获取到当前被拦截的方法参数---实体对象
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0) {
            return;
        }
        Object entity = args[0];
        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        //根据对应的操作类型，为对应的属性赋值
        if (type == OperationType.INSERT) {
            //为四个公共字段赋值
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, currentId);
                setCreateTime.invoke(entity, now);
                setCreateUser.invoke(entity, currentId);
            }catch (Exception e){
                e.printStackTrace();
            }
        }else if( type == OperationType.UPDATE){
            //为两个个公共字段赋值
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, currentId);
            }catch (Exception e){
                e.printStackTrace();
            }
        }

    }
}
